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Title: Absence of ferromagnetic order in high quality bulk Co-doped ZnO samples.
Authors: Carvalho, Hugo Bonette de
Godoy, Marcio Peron Franco de
Pais, Rafael Witter Dias
Mir, Mirta
Zevallos, Ângela Maria Ortiz de
Iikawa, Fernando
Brasil, Maria José Santos Pompeu
Chitta, Valmir Antônio
Ferraz, Wilmar Barbosa
Boselli, Marco Aurélio
Sabioni, Antônio Claret Soares
Issue Date: 2010
Citation: CARVALHO, H. B. de et al. Absence of ferromagnetic order in high quality bulk Co-doped ZnO samples. Journal of Applied Physics, v. 108, n. 3, p. 033914-1/033914-5, 2010. Disponível em: <>. Acesso em: 27 fev. . 2019.
Abstract: Bulk Zn1−xCoxO samples were synthesized via standard solid-state reaction route with different Co molar concentrations up to 21%. A detailed microstructural analysis was carried out to investigate alternative sources of ferromagnetism, such as secondary phases and nanocrystals embedded in the bulk material. Conjugating different techniques we confirmed the Zn replacement by Co ions in the wurtzite ZnO structure, which retains, however, a high crystalline quality. No segregated secondary phases neither Co-rich nanocrystals were detected. Superconducting quantum interference device magnetometry demonstrates a paramagnetic Curie–Weiss behavior with antiferromagnetic interactions. We discuss the observed room temperature paramagnetism of our samples considering the current models for the magnetic properties of diluted magnetic semiconductors.
ISSN: 00218979
metadata.dc.rights.license: O periódico Journal of Applied Physics permite o depósito da versão PDF do editor em Repositório Institucional. Fonte: Sherpa/Romeo <>. Acesso em: 28 fev. 2014.
Appears in Collections:DEFIS - Artigos publicados em periódicos

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